Evaluate
15
Factor
3\times 5
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\begin{array}{l}\phantom{12)}\phantom{1}\\12\overline{)180}\\\end{array}
Use the 1^{st} digit 1 from dividend 180
\begin{array}{l}\phantom{12)}0\phantom{2}\\12\overline{)180}\\\end{array}
Since 1 is less than 12, use the next digit 8 from dividend 180 and add 0 to the quotient
\begin{array}{l}\phantom{12)}0\phantom{3}\\12\overline{)180}\\\end{array}
Use the 2^{nd} digit 8 from dividend 180
\begin{array}{l}\phantom{12)}01\phantom{4}\\12\overline{)180}\\\phantom{12)}\underline{\phantom{}12\phantom{9}}\\\phantom{12)9}6\\\end{array}
Find closest multiple of 12 to 18. We see that 1 \times 12 = 12 is the nearest. Now subtract 12 from 18 to get reminder 6. Add 1 to quotient.
\begin{array}{l}\phantom{12)}01\phantom{5}\\12\overline{)180}\\\phantom{12)}\underline{\phantom{}12\phantom{9}}\\\phantom{12)9}60\\\end{array}
Use the 3^{rd} digit 0 from dividend 180
\begin{array}{l}\phantom{12)}015\phantom{6}\\12\overline{)180}\\\phantom{12)}\underline{\phantom{}12\phantom{9}}\\\phantom{12)9}60\\\phantom{12)}\underline{\phantom{9}60\phantom{}}\\\phantom{12)999}0\\\end{array}
Find closest multiple of 12 to 60. We see that 5 \times 12 = 60 is the nearest. Now subtract 60 from 60 to get reminder 0. Add 5 to quotient.
\text{Quotient: }15 \text{Reminder: }0
Since 0 is less than 12, stop the division. The reminder is 0. The topmost line 015 is the quotient. Remove all zeros at the start of the quotient to get the actual quotient 15.
Examples
Quadratic equation
{ x } ^ { 2 } - 4 x - 5 = 0
Trigonometry
4 \sin \theta \cos \theta = 2 \sin \theta
Linear equation
y = 3x + 4
Arithmetic
699 * 533
Matrix
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
Simultaneous equation
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
Differentiation
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
Integration
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
Limits
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}